Python: How to concatenate all possible combinations in two lists?

Question

list1=['A','B']

list2=[1,2,3]

How do I make it so the output shows all possible combinations in this order and without any brackets?

A1

A2

A3

B1

B2

B3

Answer 1

You can use itertools.product:

from itertools import product
list1 = ['A', 'B']
list2 = [1, 2, 3]
for e1,e2 in product(list1, list2):
    print(e1+str(e2))

Output:

A1
A2
A3
B1
B2
B3

Answer 2

You may use:

list3 = [a+b for a in list1 for b in map(str, list2)]
print(*list3, sep = "\n") 
A1
A2
A3
B1
B2
B3

Answer 3

You can use:

list1 = ['A', 'B']
list2 = [1, 2, 3]
for i in list1:
    for j in list2:
        print(i+str(j))